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19 April 2024

» arxiv » 1505.0228

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Criticality and Big Brake singularities in the tachyonic evolutions of closed Friedmann universes with cold dark matter
Zsolt Horváth ; Zoltán Keresztes ; Alexander Yu. Kamenshchik ; László Á. Gergely ;
Date:	1 May 2015
Abstract:	The evolution of a closed Friedmann universe filled by a tachyon scalar field with a trigonometric potential and cold dark matter (CDM) is investigated. A subset of the evolutions consistent to 1$sigma $ confidence level with the Union 2.1 supernova data set is identified. The evolutions of the tachyon field are classified. Some of them evolve into a de Sitter attractor, while others proceed through a pseudo-tachyonic regime into a sudden future singularity. Critical evolutions leading to Big Brake singularities in the presence of CDM are found and a new type of cosmological evolution characterized by singularity avoidance in the pseudo-tachyon regime is presented.
Source:	arXiv, 1505.0228
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